How to implement NT authentication using Java

Hello, I have to implement NT authentication in our website for customer Signin and authentication. We are developing our site on IPlanet App server. Earlier I have tried to implement the same with JavaWebserver but in vain. My requirement is like this: 1) When the user clicks on Sign in button, the challenge-response window shoud appear. When the user enters his userid and password we have to authenticate him. 2) When the user enrolls in our site, we are storing his details in Directory Server using LDAP. How can we store the same in NTLM(NT environment). How about password changes and new password allocation with NT authentication. I have heard that we can do the same using ASP. But now we are using Java. So I need a solution for it. Thanking you in advance Shyam

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